package com.zxf.field_method04;

public class CircleTest {
    public static void main(String[] args) {
        Circle  circle  =new  Circle();

        circle.r=10;

        circle.aera();

        double pai=3.1415926;
        double s=circle.area2(pai);
        System.out.println("半径为"+circle.r+"的圆，的面积为"+s);


    }
}
